<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="addSubject">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="item.id">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.gender }}</td>
          <td>
            <button @click="delSubject(item.id)">删除</button>
            <button @click="bjSubject(item.id)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      list: [
        { id: 1, name: '张三', age: 18, gender: '男' },
        { id: 2, name: '李四', age: 19, gender: '女' },
        { id: 3, name: '王五', age: 20, gender: '男' },
      ],
      id: '',
      name: '',
      age: '',
      gender: '',
    }
  },
  methods: {
    delSubject(id) {
      this.list = this.list.filter((item) => item.id !== id)
    },
    addSubject() {
      if (!this.name || !this.age) {
        alert('必须都有值才能增加新数据 ')
      } else {
        this.list.push({
          id: this.id,
          name: this.name,
          age: this.age,
          gender: this.gender,
        })
        this.name = ''
        this.age = ''
        this.gender = ''
        this.id = ''
      }
    },
    bjSubject(id) {
      this.list.forEach((item) => {
        if (id === item.id) {
          this.name = item.name
          this.age = item.age
          this.gender = item.gender
          this.id = item.id
        }
      })
    },
  },
}
</script>
